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5-12 GSM Transmit
5-19
Tx On (level : 5)
U304
Yes
Pin 2
30 dBm
No
U304
Yes
Pin 7
30 dBm
No
U312
Yes
Pin 1
30 dBm
No
U312
Pin 1
-10 dBm
No
U200
Yes
Pin 6
-10 dBm
No
U200
No
Pin 7
0.5 V
Pin 5
2.8 V
Pin 3 = 0.5~2.5 V
Yes
U305
No
pin 30, 47
U107
-10 dBm
Yes
U305
No
Pin 17, 18, 19, 20
40 mV
Yes
Check U305
No
Pin 38
2.5 V
Pin 35
0.5 V
Yes
Resolder
U108
Resolder
J301
Check
VC1 : L
VC2 : H
VC3 : L
No
Resolder
U318, C353
Check
Yes
U312 : +VBATT
Pin 2 (APC)
OK?
Resolder or Change
C698, R335, R364, R366
Resolder
U200, R343
Resolder
U305, U302
OneC(U108)
Resolder
Resolder
U201 (Pin35, Pin38)
Flow chart of trouble shooting and Circuit Diagram
Yes
Change or Resolder
U304
Check
Ant. S/W, Control Circuit
Yes
Resolder or
Change U312
No
Check +VBATT
or APC Control
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